She ought to stop work; she has a headache because she_____too long.

A has been reading
B.had read
C is reading
Dread
出自:吉林大学大学英语

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块